Therapeutic lamp



May 24, 1 932. v G. D. RICE 1,859,601

' THERAPEUTIC LAMP Filed March 25. 1929 fray 6 225 George [7. F106Patented May 1932 a eaonea n. RICE, or 03101160, minors 'rnnmrnurro LmrApplication fled Haroh 23, 1929. Serial No. 349,309.

This invention relates to therapeutic lamps and its primary object is toeffect a saving of current and obtain maximum output of the radiatedenergy and particularly the invisible radiant energy.

' Another object of the invention is the provision of a generallyimproved and simplified construction that'may' be economically produced.Other objects and advantages of the invention will appear from thefollowing detailed description taken in connection with the accompanyingdrawings, in which Figure 1 is an axial sectional View through a lampembodying the 'present invention showing the filament and filament stemin elevation;

, Figure 2 is a transverse sectional view taken on the line 22 of Figure1;

Figure 3 is a-fragmentary view showing another form of filamentembodying the present invention;

Figure .4 is an end view of the filament and reflector shown in Figure 3and taken from the outerend of the filament;

Figure 5 is a view similar to Figure 3 showing another form of filamentembodying the presentinvention; and a Figure 6 is an end view taken fromthe outer end of the filament and reflector shown Figure'5.

In the drawings, 10 indicates a suitable bulb having -a suitable .base12. The bulb 10 is preferably made of special glass designed topassmaximum infra-red or other invisible radiant rays desired but this mayvary. The base portion 12 is preferably of bakelite or other suitable orpreferred insulating material preferably of a material which will sealwell to the marginal edge of the bulb around the base opening 14. Thebase portion 12 is surrounded by a conducting sleeve 15 preferably ofcopper, brass or other suitable conductin material which may be cemented'upon t e base and to the bulb 10. Below the base portion 12 theinsulating body is preferably of asphaltum or other equivalent1nsulating material as designated at 16 which I find provides a betterseal with the ad]acent parts and surrounding the lower reduced end 18 ofthe insulating body is a threaded brass or other conducting sleeve 20forming a conducting plug for threaded engagement with the ordinarylight socket or outlet.

. The lead-in wires are indicated at22 and 23 and these lead-in Wirespass through and are sealed in the stem 24 and are connected at theirinner ends at 25 with the filament 26. One of the wires 22 is connectedat 27 with the plug contact shell 20 and the other 00 wire 23 is shownas connected at 28 with the end contact 29 which is" insulated from thecontact shell 20 as well understood in the art.

The stem 24 which may be of glass insulates then fused into t e base endof the bulb 10 at 32 whereupon the bulb 10 is evacuated and theevacuation opening, as for example through the stem 24, is closed andsealed.

The filament shown in Figures 1 and 2 is coiled in a plurality ofconvolutions to form a conical helix with its axis substantiallyparallel to the direction of application of rays from the lamp. Thefilament is preferably of 76 a material of relatively high infra-red rayefliciency and of relatively low visible light ray efliciency. Astereopticon filament of carbon silicate is suitable for this purpose,the size of filamentwire in an illustratedembodiment of the inventiondrawing two hundred watts,.which may vary. The open or larger end 34 ofthe conical filament helix shown is preferabl directed toward the pointof application of t e rays from the lamp and 3 thesmaller or reduced end35 of the conical filament is disposed away from the point ofapplication of the rays.

The opposite ends 36 and 37 of the filament are suitably extended andconnected at 25' with the lead-in wires 22 and 23 respectively. With theconical filament formation of this embodiment of the invention and thearrangement of this conical filament formation with the larger open enddirected toward the point of application, I find. that at least aincrease over the presenttype filament arrangement is obtained. Thereflected energy;- that is, the ener' ment element itse f which amountsto about reflected Within the fila- 50% of the energy generated isdirected upon the point of application from the open end ofthe-filament. The formation of the filament rovides a maximum invisibleradiant ray 'dlschar'ged in one direction and the arrangement of thisfilament within the bulb directs this maximum discharge directly towardthe point of application. The lateral discharge is less and the internallateralreflection isdirected from the larger open end toward the pointof application. The external lateral discharge may be utilized by meansof any suitable or preferred reflector arrangement, not shown.-

Sealed with the filament 26 and stem 24 within the bulb 10 is areflector 40. This reflector 4O ispreferably ofmetal and is secured andsupported upon the stem 24 preferably on the axis of the filament 26, asshown. The reflector shown is of circular concave formation toward thefilament 26 and is .provided with a central opening 42 through which thestem 24 passes, the reflector being suitably secured upon the stem 24marginally around this opening 42.

This reflector arrangement within the bulb and on the axis of the helixreflects the rays from the smaller end of the conical filament outtoward the point of application and still further with this arrangement,the rays from the smaller end of the filament are reflected out in thedirection of emission of the in-- creased ray discharge from the largerend of the filament. The arrangement of the helical filament with itsaxis substantially parallel to the direction of application of the raysgreatly increases the efliciency of the lamp and then by reflecting therays from the opposite end of the helical filament by a reflector on theaxis of the filament, this increased efficiency is still furtherincreased. This elfects a material saving of current and obtains maximumoutput of the radiated energy and particularly in the infra-red or otherequivalent invisible radiant energy.

In the embodiment shown in Figures 8 and I 4, the filament is coiled ina plurality of convolutions to form a substantially cylindrical helixwith the turns 52 at the inner end and away from the point ofapplication reduced to reduce the end of the helical filament away fromthe point of application of the rays from thefilament. Otherwise thelarger open end of the filament is directed toward the point ofapplication as before and the axis of the filament is preferablysubstantially parallel to the direction of application of the rays fromthe lamp and directedtoward the point of application and the reflector53 is mounted upon the stem 54 and on the axis ofthe filament away fromthe point of application of the rays.

The larger open end of the filament is indicated at 58 and the lead-inwires 55 are shown as connected with the ends of the filament at 56.

In the embodiment of Figures 5 and 6, the filament is coiled in aplurality of convolutions to form a substantially cylindrical helix withboth ends open and without the reduced .end of the previous embodiment.

ably enclosed and sealed within the bulb of the lamp.

I do not intend to be limited to the precise details shown or described.It is to be understood that the filament occurs singly, as

shown, or in groups of any desired number within a common enclosure.Where two or more filaments or filament and reflector combinations areemployed all of the filaments will preferably be arranged in the mannerdescribed in connection with the single filament herein and thefilaments may be connected in the electricl circuit within the vacuuminside the bulb either in series or parallel relation.

I claim:

As an article of manufacture a thereapeutic lamp comprising a bulb and afilament formed directly of carbon silicate, said filament beingdisposed within said bulb and coiled in a plurality of convolutions toform a conical helix with its axis substantially parallel to thedirection of application of rays from said lamp and directed toward thepoint of application, the larger end of said helix being toward thepoint of application of the rays from the lamp and the smaller end ofthe helix being away from the point of application, an insulating basesealed to said bulb substantially in axial alignment with the axis ofsaid filament, a contact shell on said base, a frangible lead-in stemsecured to said base and projecting into said bulb, a refiector disposedwithin the bulb and mounted on said stem on the axis of said helix, andlead-in wires entering through said base and said stem and connectedwith said filament.

In witness whereof, I hereunto subscribe my name this 20th da of March,1929.

EORGE D. RICE.

